Marker pen



FIG. 1 is a perspective view of the marker pen;

FIG. 2 is a left side view thereof, the right side view being a mirror image thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a front view of the marker pen with its cap removed therefrom; and,

FIG. 7 is a perspective view of the marker pen with its cap removed therefrom. 

The ornamental design for a marker pen, as shown and described. 